PM> Add-Migration MyFirstMigration
System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.RuntimeAssembly.get_DefinedTypes()
at Microsoft.Data.Entity.Design.Internal.StartupInvoker..ctor(String startupAssemblyName, String environment)
at Microsoft.Data.Entity.Design.DbContextOperations..ctor(ILoggerProvider loggerProvider, String assemblyName, String startupAssemblyName, String environment)
at Microsoft.Data.Entity.Design.MigrationsOperations..ctor(ILoggerProvider loggerProvider, String assemblyName, String startupAssemblyName, String environment, String projectDir, String rootNamespace)
at Microsoft.Data.Entity.Design.OperationExecutor.<>c__DisplayClass3_0.<.ctor>b__3()
at Microsoft.Data.Entity.Internal.LazyRef`1.get_Value()
at Microsoft.Data.Entity.Design.OperationExecutor.<AddMigrationImpl>d__7.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at Microsoft.Data.Entity.Design.OperationExecutor.OperationBase.<>c__DisplayClass4_0`1.<Execute>b__0()
at Microsoft.Data.Entity.Design.OperationExecutor.OperationBase.Execute(Action action)
Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.